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Employee Bargaining Agreements and Benefit Plans - Plan's Assets Carried at Fair Value (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	$ 9	$ 11
Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	5	6
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	4	5
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	1	1
Level 1 [Member] \| Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	1	1
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	3	4
Level 2 [Member] \| Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	3	4
Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	5	6
Level 3 [Member] \| Annuity Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value measurements	$ 5	$ 6

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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